component
UM809RS
Public Made by Adomby adom
Union Semiconductor Supervisor And Reset ICs, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUM809RS
Union Semiconductor · Supervisor And Reset ICs · SOT-23-3
UM809RS from Union Semiconductor, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground pin of the supply, 0V reference for the reset supervisor. |
| 2 | RESET | output | Push-pull active-low reset output (UM809), asserted within 10µs when VCC falls below the reset threshold and held for a 140ms minimum (240ms typ) timeout after VCC rises above it; output sources up to 20mA max and is valid down to VCC=1V. |
| 3 | VCC | power_in | Supply voltage input monitored against the reset threshold (2.63V typ for UM809RS), operating range 1.0V to 10V (absolute max -0.3 to +10V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Union Semiconductor |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VCC Range (TA=0°C to +70°C) | VCC | 1 | 10 | V | TA=0°C to +70°C | 3 | |
| VCC Range (TA=-40°C to +85°C) | VCC | 1.2 | 10 | V | TA=-40°C to +85°C | 3 | |
| Supply Current (UM8_R/S/T/Z) | ICC | 3 | 5 | μA | VCC<3.6V, UM8_R/S/T/Z | 3 | |
| Reset Threshold UM8_R | VTH | 2.54 | 2.63 | 2.67 | V | TA=+25°C | 3 |
| Reset Threshold UM8_R | VTH | 2.51 | 2.69 | V | TA=-40°C to +85°C | 3 | |
| Reset Active Timeout Period | 140 | 240 | 360 | ms | TA=-40°C to +85°C | 3 | |
| RESET Output Voltage Low (Push-Pull Active Low, UM809R/S/T/Z) | VOL | 0.3 | V | VCC=VTH min, ISINK=1.2mA, UM809R/S/T/Z | 3 | ||
| RESET Output Voltage Low (Push-Pull Active Low, all UM809 versions) | VOL | 0.3 | V | VCC≤1.0V, ISINK=50μA | 3 | ||
| Supply Voltage | VCC | -0.3 | 10 | V | 2 | ||
| RESET, RESET (Push-Pull) voltage | -0.3 | V | Stated as -0.3 to VCC+0.3 V | 2 | |||
| Input Current, VCC | ICC | 20 | mA | 2 | |||
| Output Current, RESET, RESET | IO | 20 | mA | 2 | |||
| Rate of Rise, VCC | 100 | V/μs | 2 | ||||
| Continuous Power Dissipation, SOT23-3 | PD | 320 | mW | SOT23-3 package | 2 | ||
| Operating Junction Temperature | TJ | -40 | 85 | °C | 2 | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 2 | ||
| Lead Temperature (Soldering) | 300 | °C | Soldering, 10s | 2 |
CAD (KiCad official)
- Symbol:
UM809RS - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
um809rs-etched.step/um809rs-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);um809rs.step/um809rs.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Union Semiconductor datasheet (14 pp, sha256
a8ef262a39510d83, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).